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The narrow feature in power flux deposition profiles in COMPASS limiter plasmas
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SYSNO ASEP 0433986 Document Type C - Proceedings Paper (int. conf.) R&D Document Type The record was not marked in the RIV Title The narrow feature in power flux deposition profiles in COMPASS limiter plasmas Author(s) Dejarnac, Renaud (UFP-V) RID, ORCID
Stangeby, P.C. (CA)
Goldston, R.J. (US)
Horáček, Jan (UFP-V) RID, ORCID
Hron, Martin (UFP-V) RID, ORCID
Komm, Michael (UFP-V) RID, ORCID
Pánek, Radomír (UFP-V) RID
Vondráček, Petr (UFP-V) RID, ORCID
Gauthier, E. (FR)
Kocan, M. (FR)
Pitts, R.A. (FR)Number of authors 12 Source Title International Workshop & Summer School on Plasma Physics. - Sofia : University of Sofia, 2014 Publication form Print - P Action International Workshop & Summer School on Plasma Physics/6./ Event date 30.06.2014-06.07.2014 VEvent location Kiten Country BG - Bulgaria Event type WRD Language eng - English Country BG - Bulgaria Keywords Power flux ; narrow channel ; limiter ; plasma ; tokamak Subject RIV BL - Plasma and Gas Discharge Physics Institutional support UFP-V - RVO:61389021 Annotation The current ramp-up phase of ITER discharges will be in limiter configuration, with the high field side (HFS) wall as the favored start-up surface. Recent experimental observations on JET using IR thermography show a clear narrow feature in the parallel heat flux density q// near the Last Closed Flux Surface of inner wall limiter (ILW) plasmas. A significant effort has subsequently been made on the COMPASS tokamak to investigate this effect using a specially diagnosed (IR thermography + Langmuir probes), roof-shaped IWL. Using detailed analysis of the probe data, in combination with power fluxes derived from IR measurements, this paper discusses the possible physics mechanisms that could give rise to the narrow heat flux channel. Evidence of a narrow heat flux feature with a power decay length of λq,omp ~5 mm is obtained with the probes, consistent with the findings from IR thermography viewing the same limiter. One possible contribution to this narrow feature might be a Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2015
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